Why You Should Avoid Using Type Assertion in TypeScript
Published in
May 9, 2022
You’ve probably used the as type assertion at least once when working with Typescript. For example:
Type assertions are a way to tell the compiler, “trust me, I know what I’m doing.”
The problem is that it doesn’t do any special data checking. TypeScript assumes that you, the programmer, have performed any special checks that you need.
Now let’s say we need to update our interface and add a new property:
We won’t get any Typescript errors in this case, which can lead to bugs in our application. A safer option is always to type the variable explicitly:
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